(1) The following rules cover requirements for 0-750 volt
multi conductor cable having a bare neutral and are supplemental to the other
rules of this order.

(2) The term "messenger" as defined in Rule 21.9 of this
order when used in Rule 54.10 of this order includes the bare neutral conductor
whenever such conductor serves both as a conductor and also as a principal
supporting member of the cable.

B. Pole Arrangement And Clearances

(1) Clearance From Poles: Multiconductor cables having
a bare neutral may have clearances less than 15 inches from center line and
three inches from surface of pole, as specified in Table 1, Column D, Cases
8 and 9, respectively, but shall have a clearance of not less than 2i inches
from the surface of pole and shall be supported on an insulator.

(2) Between Conductors In Cables: No specified clearance
is required between the insulated phase conductors and the bare neutral (see
Rule 57.4-C).

(3) Conductor Arrangement: In parallel construction, cables
shall not be attached to more than one side of a pole (there being four sides).

(4) At Cable Terminations: The clearances required by
Rule 54.10-E of this order between a cable and unprotected line conductors
shall not be held to apply between a cable (and its grounded messenger) and
unprotected conductors of the same circuit on poles where unprotected conductors
enter (or leave) a cable. On such poles no grounded messenger shall be less
than 15 inches from centerline of the pole.

(5) Dead-end Construction: On poles with the messenger
dead-ended in more than one direction, the grounded messenger or insulated
phase conductors of the cable shall not be attached to more than two sides
of the pole and shall be not less than 2 ½ inches from the surface
of the pole. On the climbing space side, service drops shall not be supported
within 15 inches of the surface of the pole. The climbing space shall be
determined by Rule 54.10-F(3) of this order.

C. Conductor Material And Strength

(1)
Insulation: The phase conductors including jumper connections shall be
covered with an insulation suitable for the voltage involved and shall conform
with the standards established by the Insulated Power Cable Engineers Association,
in Part 1, Section 7.3 of "Thermoplastic-Insulated Wire and Cable for the
Transmission and Distribution of Electrical Energy", Insulated Power Cable
Engineers Association Standard S-61-402, approved January 12, 1961, and National
Electrical Manufacturers Association Standard WC5-1961, approved May 15,
1961.

(2) Messenger: Where cables are not maintained from a cable
chair, the addition of the 200 pounds of vertical load specified in Rule
49.7-C may be reduced to 50 pounds to allow for the load imposed by workmen
on ladders.

D. Conductor Spacing

A vertical separation between individual conductors when supported in individual
clevises or a multiconductor rack shall be not less than 6 inches.

E. Vertical Clearance Between Conductor Levels

When attached to poles or wood crossarms at less than 15 inches from center
line of pole, bare neutral multiconductor cable shall be not less than 6
feet vertically above or 6 feet vertically below unprotected conductors except
as modified below:

(1) With Guard Arm Below Conductors Of 0-750 Volts: Where
a guard arm is placed above bare neutral multiconductor cable in accordance
with the provisions of Rule 57.7, the clearance of 6 feet may be reduced
to not less than 4 feet below unprotected conductors of 0-750 volts.

(2) Above Conductors Of 0-750 Volts More Than 15 Inches
From Center Line Of Pole: The vertical clearance between protected conductors
of 0-750 volts attached at more than 15 inches from the center line of pole and bare neutral multiconductor cable above may be less than 6 feet
but not less than 4 feet and no guard arm is required.

(3) Under A Transformer No guard arm will be required
over bare neutral multiconductor cable attached to the surface of a pole
directly below a transformer installation provided that at that level all
attachments to the pole shall be approximately in the vertical plane through
the center lines of pole and transformer installation and no cable so attached
makes an angle greater than 60 degrees with that plane. The cable so supported
shall have a vertical clearance of not less than 48 inches below the level
of conductors on the hanger arm; a vertical clearance not less than as specified
in Rule 54.4-C6 below the lowest point of the drip loop of primary leads
to the transformer; and a vertical clearance of not less than 10 inches below
the lowest part of the transformer case or hangers.

(4) Related Bare Neutral Multiconductor Cable And Crossarm:
Where bare neutral multiconductor cable is connected to conductors supported
on a crossarm on the same pole, the vertical clearance between the level
of conductors of 0-750 volts on the crossarm and the bare neutral multiconductor
cable shall be not less than 2 feet and climbing space shall be maintained
in the same quadrant on the same side of pole through both conductor
levels in accordance with climbing space requirements in Rules 54.7 and 54.10-F.
This provision is not applicable where the crossarm is a combination arm.

F. Climbing Space

(1) A climbing space shall be maintained through the level
of conductors supported in bare neutral multiconductor cable construction
and for a vertical distance of not less than 4 feet above and below such
cable. The position of the climbing space through the levels of conductors
in such cable construction shall be related to climbing space for conductor
levels above and below the cable in accordance with Rules 54.7-A and 93.
The depth of the climbing space shall be measured from the center line of
the pole.

(2) The dimensions of the climbing space shall be 30 inches
square, and shall be provided on one side of the pole with the extremities
of such width equidistant from the center line of pole. On poles on which
transformers are pole bolted in line with primary conductors, a 30inch square
climbing space shall be provided.

(3) On poles with the messenger dead-ended and on corner
poles, a 30-inch climbing space shall be provided in one quadrant or on one
side of the pole. Suitably protected vertical runs or risers and ground wires
attached to the surface of poles, and guys, are allowed in climbing spaces
provided that no more than one guy or one vertical riser, run or ground wire
are installed in any 4-foot vertical section of climbing space. The terminals
or terminal fittings of risers or runs shall not be installed within climbing
spaces.

G. Service Drops

Phase conductors of service drops taken from bare neutral multiconductor
cables shall have insulation equivalent to that specified in Rule 54.10-C1.
Where service drops are supported on ACSR or aluminum messenger, the messenger
shall be protected against abrasion. Services supported on the messenger
shall be attached not less than 15 inches from the surface of the pole.

H. Fastenings

In the application of Rule 57.5, where cables are not maintained from a cable
chair, the addition of 200 pounds vertical load, specified in Rule 49.7-C
may be reduced to 50 pounds to allow for the load imposed by workmen on ladders.

Final Version
Rule 54.10

54.10 Low Voltage Multiconductor Cable with Bare Neutral,
0-750 Volts

A. General

(1) The following rules cover requirements for 0-750 volt
multi conductor cable having a bare neutral and are supplemental to the other
rules of this order.

(2) The term "messenger" as defined in Rule 21.9 of this
order when used in Rule 54.10 of this order includes the bare neutral conductor
whenever such conductor serves both as a conductor and also as a principal
supporting member of the cable.

B. Pole Arrangement And Clearances

(1) Clearance From Poles: Multiconductor cables having
a bare neutral may have clearances less than 15 inches from center line and
three inches from surface of pole, as specified in Table 1, Column D, Cases
8 and 9, respectively, but shall have a clearance of not less than 2i inches
from the surface of pole and shall be supported on an insulator.

(2) Between Conductors In Cables: No specified clearance
is required between the insulated phase conductors and the bare neutral (see
Rule 57.4-C).

(3) Conductor Arrangement: In parallel construction, cables
shall not be attached to more than one side of a pole (there being four sides).

(4) At Cable Terminations: The clearances required by
Rule 54.10-E of this order between a cable and unprotected line conductors
shall not be held to apply between a cable (and its grounded messenger) and
unprotected conductors of the same circuit on poles where unprotected conductors
enter (or leave) a cable. On such poles no grounded messenger shall be less
than 15 inches from centerline of the pole.

(5) Dead-end Construction: On poles with the messenger
dead-ended in more than one direction, the grounded messenger or insulated
phase conductors of the cable shall not be attached to more than two sides
of the pole and shall be not less than 2 ½ inches from the surface
of the pole. On the climbing space side, service drops shall not be supported
within 15 inches of the surface of the pole. The climbing space shall be
determined by Rule 54.10-F(3) of this order.

C. Conductor Material And Strength

(1)
Insulation: The phase conductors including jumper connections shall be
covered with an insulation suitable for the voltage involved and shall conform
with the standards established by the Insulated Power Cable Engineers Association,
in Part 1, Section 7.3 of "Thermoplastic-Insulated Wire and Cable for the
Transmission and Distribution of Electrical Energy", Insulated Power Cable
Engineers Association Standard S-61-402, approved January 12, 1961, and National
Electrical Manufacturers Association Standard WC5-1961, approved May 15,
1961.

(2) Messenger: Where cables are not maintained from a cable
chair, the addition of the 200 pounds of vertical load specified in Rule
49.7-C may be reduced to 50 pounds to allow for the load imposed by workmen
on ladders.

D. Conductor Spacing

A vertical separation between individual conductors when supported in individual
clevises or a multiconductor rack shall be not less than 6 inches.

E. Vertical Clearance Between Conductor Levels

When attached to poles or wood crossarms at less than 15 inches from center
line of pole, bare neutral multiconductor cable shall be not less than 6
feet vertically above or 6 feet vertically below unprotected conductors except
as modified below:

(1) With Guard Arm Below Conductors Of 0-750 Volts: Where
a guard arm is placed above bare neutral multiconductor cable in accordance
with the provisions of Rule 57.7, the clearance of 6 feet may be reduced
to not less than 4 feet below unprotected conductors of 0-750 volts.

(2) Above Conductors Of 0-750 Volts More Than 15 Inches
From Center Line Of Pole: The vertical clearance between protected conductors
of 0-750 volts attached at more than 15 inches from the center line of pole and bare neutral multiconductor cable above may be less than 6 feet
but not less than 4 feet and no guard arm is required.

(3) Under A Transformer No guard arm will be required
over bare neutral multiconductor cable attached to the surface of a pole
directly below a transformer installation provided that at that level all
attachments to the pole shall be approximately in the vertical plane through
the center lines of pole and transformer installation and no cable so attached
makes an angle greater than 60 degrees with that plane. The cable so supported
shall have a vertical clearance of not less than 48 inches below the level
of conductors on the hanger arm; a vertical clearance not less than as specified
in Rule 54.4-C6 below the lowest point of the drip loop of primary leads
to the transformer; and a vertical clearance of not less than 10 inches below
the lowest part of the transformer case or hangers.

(4) Related Bare Neutral Multiconductor Cable And Crossarm:
Where bare neutral multiconductor cable is connected to conductors supported
on a crossarm on the same pole, the vertical clearance between the level
of conductors of 0-750 volts on the crossarm and the bare neutral multiconductor
cable shall be not less than 2 feet and climbing space shall be maintained
in the same quadrant on the same side of pole through both conductor
levels in accordance with climbing space requirements in Rules 54.7 and 54.10-F.
This provision is not applicable where the crossarm is a combination arm.

F. Climbing Space

(1) A climbing space shall be maintained through the level
of conductors supported in bare neutral multiconductor cable construction
and for a vertical distance of not less than 4 feet above and below such
cable. The position of the climbing space through the levels of conductors
in such cable construction shall be related to climbing space for conductor
levels above and below the cable in accordance with Rules 54.7-A and 93.
The depth of the climbing space shall be measured from the center line of
the pole.

(2) The dimensions of the climbing space shall be 30 inches
square, and shall be provided on one side of the pole with the extremities
of such width equidistant from the center line of pole. On poles on which
transformers are pole bolted in line with primary conductors, a 30inch square
climbing space shall be provided.

(3) On poles with the messenger dead-ended and on corner
poles, a 30-inch climbing space shall be provided in one quadrant or on one
side of the pole. Suitably protected vertical runs or risers and ground wires
attached to the surface of poles, and guys, are allowed in climbing spaces
provided that no more than one guy or one vertical riser, run or ground wire
are installed in any 4-foot vertical section of climbing space. The terminals
or terminal fittings of risers or runs shall not be installed within climbing
spaces.

G. Service Drops

Phase conductors of service drops taken from bare neutral multiconductor
cables shall have insulation equivalent to that specified in Rule 54.10-C1.
Where service drops are supported on ACSR or aluminum messenger, the messenger
shall be protected against abrasion. Services supported on the messenger
shall be attached not less than 15 inches from the surface of the pole.

H. Fastenings

In the application of Rule 57.5, where cables are not maintained from a cable
chair, the addition of 200 pounds vertical load, specified in Rule 49.7-C
may be reduced to 50 pounds to allow for the load imposed by workmen on ladders.

I. Extended Messenger

Messengers may be extended in bare neutral multiconductor cable construction
provided the messenger is sectionalized as a guy.

J. Sags

In the application of Rule 57.9 the 200-pound additional vertical loading
specified for a man and cable chair may be reduced to 50 pounds where the
cable is not maintained from a cable chair.